D-Net

import { Injectable, Inject, PLATFORM_ID } from '@angular/core';

import { HttpInterceptor, HttpRequest, HttpHandler } from '@angular/common/http';

import { TransferState } from '@angular/platform-browser';

import { properties } from "../../environments/environment";

@Injectable({

  providedIn: 'root'

})

export class CacheInterceptorService implements HttpInterceptor {

  cachingRequests = [

    // Remove 2 following lines when bug with hidden refine filters is solved.

    "/resources2/?format=json&refine=true&fields=resultbestaccessright&fields=relfunder&fields=relfundinglevel0_id&fields=relproject&fields=instancetypename&fields=resultlanguagename&fields=community&fields=resulthostingdatasource&fields=country&&fq=resultbestaccessright exact \"Open Access\"&type=results&page=0&size=0",

    "/resources2/?format=json&refine=true&fields=funder&fields=fundinglevel0_id&fields=projectstartyear&fields=projectendyear&fields=projectecsc39&&type=projects&page=0&size=0",

    "/resources2/?format=json&refine=true&fields=resultbestaccessright&fields=relfunder&fields=instancetypename&fields=resultlanguagename&fields=community&fields=resulthostingdatasource&fields=country&&type=results&page=0&size=0",

    "/resources2/?format=json&refine=true&fields=resultbestaccessright&fields=relfunder&fields=relfundinglevel0_id&fields=relproject&fields=instancetypename&fields=resultlanguagename&fields=community&fields=resulthostingdatasource&fields=country&&fq=resultbestaccessright%20exact%20%22Open%20Access%22&fq=relfunder%20exact%20%22ec__________%3A%3AEC%7C%7CEuropean%20Commission%7C%7CEC%22&type=results&page=0&size=0",

    "/resources2/?format=json&refine=true&fields=resultbestaccessright&fields=relfunder&fields=instancetypename&fields=resultlanguagename&fields=community&fields=resulthostingdatasource&fields=country&&fq=resultbestaccessright%20exact%20%22Open%20Access%22&type=results&page=0&size=0",

    "/resources2/?format=json&refine=true&fields=resultbestaccessright&fields=relfunder&fields=instancetypename&fields=resultlanguagename&fields=community&fields=resulthostingdatasource&fields=country&&fq=resultbestaccessright exact \"Open Access\"&type=results&page=0&size=0",

    "/resources2/?format=json&refine=true&fields=funder&fields=projectstartyear&fields=projectendyear&fields=projectecsc39&&type=projects&page=0&size=0",

    "/resources2/?format=json&refine=true&fields=datasourcetypeuiname&fields=datasourceodlanguages&fields=datasourceodcontenttypes&fields=datasourcecompatibilityname&fields=country&fields=collectedfromname&&type=datasources&page=0&size=0",

    "/resources2/?format=json&query= ( (reldatasourcecompatibilityid exact driver or reldatasourcecompatibilityid exact driver-openaire2.0 or reldatasourcecompatibilityid exact openaire2.0 or reldatasourcecompatibilityid exact openaire3.0 or reldatasourcecompatibilityid exact openaire4.0 or reldatasourcecompatibilityid exact openaire-cris_1.1 or reldatasourcecompatibilityid exact openaire2.0_data or reldatasourcecompatibilityid exact hostedBy or relproject=*) ) &refine=true&fields=country&&type=organizations&page=0&size=0",

    "/projects/?format=json&refine=true&page=1&size=0&fields=funder",

    "/resources/?format=json&query=( oaftype exact datasource  )&refine=true&fields=datasourcetypeuiname&fields=country&fields=datasourceodsubjects&fields=datasourceodcontenttypes&fields=datasourcecompatibilityname&&type=datasources&page=0&size=0",

    "/search/v2/api/datasources/count?format=json", "/search/v2/api/publications/count?format=json", "/search/v2/api/datasets/count?format=json", "/search/v2/api/software/count?format=json", "/search/v2/api/other/count?format=json",

    "relresulttype%3Dpublication"

  ];

  constructor(private transferState: TransferState, @Inject(PLATFORM_ID) private platformId: any) {}

  public intercept(request: HttpRequest<any>, next: HttpHandler): any {

    // console.debug(new Date());

    if(this.checkForCachedRequests(request.url)) {

      const dupReq = request.clone({url: properties.cacheUrl + encodeURIComponent(request.url)});

      return next.handle(dupReq);

    } else {

      return next.handle(request);

    }

  }

  public checkForCachedRequests(url){

    if(url.indexOf("refine=true") !== -1 || url.indexOf("/count?format=json") !== -1 || url.indexOf("relresulttype%3Dpublication") !== -1) {

      return this.cachingRequests.some(partUrl => (url.indexOf(partUrl) !== -1));

    }

    return false;

  }

}